Crawling… • Special Software known as “Googlebot” is used. • Runs on large number of computers to crawl the web. • Googlebot starts from its last crawl status and busily looks for new sites,change to current and invalid links.

Step 2… • Organizing the data.. • Report on the pages visited & thus index is updated. • Index like something at back of the book.

Step3… • Presenting the Data.. • Google search doesn‟t just drive into index & fish around for what it needs. • Use of Knowledge Graph. • Several factors are used to present the most relevant search results.

Factors… Some of the know factors.. • Type of content. • Quality of content. • Freshness of content. • The user‟s region. • Legitimacy of the site. • Name and address of the website. • Search word synonyms. • Social media promotions. • How many links point to a particular web page. • The value of those links.

Page Rank Technology.. • Rank pages based on the number of other pages that link to it. • Gives an indication of the relative importance of a page. • Hence,an appropriate „SERP‟(Search Engine Result Page) listing. • Calculated by nature and number of „ back links „

Definition of Page Rank.. • “We assume page A has pages T1…Tn which point to it.The parameter „d‟ is a damping factor which can be set between 0 & 1. We usually set „d‟ to 0.85.Also C(A) is defined as the number of links going out of page A. The PageRank of a page A is given as follows: PR(A) = (1-d) + d*(PR(T1)/C(T1)+…+PR(Tn)/C(Tn)) Note that the Page Ranks form a probability distribution over web pages , so the sum of all web pages , Page Ranks will be one”

Calculating Page Rank...

Definition Of Terms • PR: Shorthand for PageRank: the actual , real ,page rank for each page as calculated by Google. • Back link : If page A links out to page B , the page B is said to have a „ back link‟ from page A.

PR(A) =(1-d)+d(PR(T1)/C(T1)+..+PR(Tn)/C(Tn)) • The PR of each page depends on the PR of the pages pointing to it. • We won‟t know what PR those pages have until the pages pointing to them have their PR calculated. • ………….and so on..

Seems impossible to do this calculation….

BUT THERE IS A SOLUTION

• Page Rank can be calculated using simple iterative algorithms . • What we need to do .. • *Remember the each value we calculate. • *Repeat the calculations lots of times.

Eric Schmidt: „How Google Works“: Die Zeit der Manager ...

How Search Works – Inside Search – Google

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